Effect of plant growth regulator on the quality of Cabernet sauvignon grape

【Objective】The study was to understand the effect of exogenous ABA,GA3 and 6-BA with different concentrations on the quality of Cabernet sauvignon grape,and to provide some theoretical evidence to improve wine grape.【Method】In this experiment,different concentrations of exogenous abscisic acid(ABA),gibberellin(GA3) and 6-Benzylaminopurine(6-BA) were respectively applied on vinifera wine grape Cabernet sauvignon.The objective of this study was to evaluate the effect of exogenous ABA,GA3 and 6-BA on the quality of the grape.【Result】The results showed that:during grape ripening,sugar,total anthocyanin and flavonoid contents in the grape berries significantly increased with total acid,tannin and total phenolics significantly reduced after applied with 100,200 mg/L ABA.After applied with 100,200,400 mg/L GA3,sugar,total anthocyanin and flavonoid contents in general increased in the grape berries,in contrast total acid,tannin and total phenolics reduced.But there were no significant differences in sugar and total acid contents.The flavonoid and total anthocyanin contents of grape berries significantly increased,while tannin and total phenolics significantly reduced after applied with 400 mg/L GA3.The total sugar content of Cabernet sauvignon fruit slightly increased with different concentrations of 6-BA treatment,but there were no significant differences.After applied with 400 mg/L 6-BA,total anthocyanin and flavonoid contents particularly increased in the grape berries,in contrast tannin and total phenolics particularly reduced.【Conclusion】100,200 mg/L ABA particularly promoted some indexes of grape,and improved the quality of the grape.400 mg/L GA3 treatments had a stimulative effect on the coloring of grape.400 mg/L 6-BA can obviously inhibit the coloring of grape.